Created an attachment (id=279486)
/var/log/messages file

I also suffer from this bug.

uname -ir:
2.6.27.19-3.2-default x86_64

/proc/interrupts:
           CPU0       CPU1                      
  0:      71832      72828   IO-APIC-edge      timer
  1:          5          7   IO-APIC-edge      i8042
  8:          1          0   IO-APIC-edge      rtc0
  9:          0          1   IO-APIC-fasteoi   acpi
 12:         72         64   IO-APIC-edge      i8042
 14:       1690       1616   IO-APIC-edge      ata_piix
 15:          0          0   IO-APIC-edge      ata_piix
 16:        581        168   IO-APIC-fasteoi   nvidia
 17:      26663      10586   IO-APIC-fasteoi   ata_piix, eth0, b43
 18:          0          0   IO-APIC-fasteoi   mmc0
 19:          1          1   IO-APIC-fasteoi   ohci1394
 20:       3236       2221   IO-APIC-fasteoi   uhci_hcd:usb1, uhci_hcd:usb4, ehci_hcd:usb7
 21:       8821       2932   IO-APIC-fasteoi   uhci_hcd:usb2, uhci_hcd:usb5, HDA Intel
 22:          0          0   IO-APIC-fasteoi   ehci_hcd:usb3, uhci_hcd:usb6
NMI:          0          0   Non-maskable interrupts
LOC:      53608      57620   Local timer interrupts
RES:      13893      16887   Rescheduling interrupts
CAL:       1241        296   function call interrupts
TLB:        216        229   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
SPU:          0          0   Spurious interrupts
ERR:          0

lspci:
00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0c)
00:01.0 PCI bridge: Intel Corporation Mobile PM965/GM965/GL960 PCI Express Root Port (rev 0c) 
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 (rev 02)
00:1c.3 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 4 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev f2)
00:1f.0 ISA bridge: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA IDE Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation GeForce 8400M GS (rev a1)
03:00.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
03:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 05)
03:01.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 22)
03:01.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 12)
03:01.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 12)
0c:00.0 Network controller: Broadcom Corporation BCM4311 802.11b/g WLAN (rev 01)

I attached the /var/log/messages file.

I have a dual core Intel Core2 CPU, and one of the cores was totally used by ksoftirqd and the network died after some time (`ping` also had an error with some sort of sendmessage buffer).